package com.ExaminStudy;

import java.util.Scanner;

public class ChiPingGuo {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int m = sc.nextInt();
        int t = sc.nextInt();
        int s = sc.nextInt();
        if (m >= 1 && m <= 100 && t >= 0 && t <= 100 && s >= 1 && s <= 10000) {
            if (s % t == 0) {
                System.out.println(m - s / t);
            } else {
                System.out.println((m - s / t) - 1);
            }

        }
    }
}
